Hi, Soloist -- welcome to the forum. In the second example, I think your son has confused "squalor" with "squander" (and I don't think the teacher realized it). "He squandered his life and money away (and ended up living in squalor) .
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Soloist(HIS): As if living in a microcasm, the biologist had grown everything needed for survival.
(TEACHER): As if he were living in a microcasm, the biologist had grown everything needed for survival.